update changelog

Author: randy-cro

CHANGELOG.md

@@ -5,4 +5,4 @@
 ### State Machine Breaking
 
 - [#20](https://github.com/crypto-org-chain/go-ethereum/pull/20) feat: support cronos precompiles
-- [#21](https://github.com/crypto-org-chain/go-ethereum/pull/21) refactor: Remove active precompiles from VMContext and fixed tests
+- [#21](https://github.com/crypto-org-chain/go-ethereum/pull/21) chore: Remove active precompiles from VMContext and fixed tests